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Old November 9, 2010, 07:52 AM   #26
Clark
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Join Date: December 4, 1999
Location: WA, the ever blue state
Posts: 2,828
I think that the max tensile strength of the brass material may be 63kpsi, the max pressure inside a case is 70kpsi for Mauser case heads, 80 kpsi for 222 case heads and 75kpsi for 300 H&H case heads.

That is because the same brass material can be formed into different shapes, with the weak spot being between a ring between the extractor groove and primer pockets.

10mm, 30 carbine, 25acp, and 7.62x39mm cases are lower than the above pressure yield because the ring between the extractor groove and the primer pocket is narrower relative to the case inside diameter.

32 S&W, 38 S&W, 30-30, and 45/70 cases are much higher yield because the ring between the extractor groove and the primer pocket is wider relative to the case inside diameter. These shapes do not get loose primer pockets, but instead have other limits to work ups.
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